package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;


@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.检验手机号
        if (!RegexUtils.isCodeInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }

        //3。符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session
//        session.setAttribute("code",code);
        //保存验证码到redis

        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送验证码：{}",code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.检验手机号
        //1.检验手机号
        if (!RegexUtils.isCodeInvalid(loginForm.getPhone())) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //2.检验验证码
//        Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        String code = loginForm.getCode();

        if (cacheCode == null || !cacheCode.toString().equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //5.判断用户是否存在
        if (user == null){
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }
        //7.保存用户信息到session
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7.保存到redis
        //7.1.随机生成登录token
        String token = UUID.randomUUID().toString();
        //7.2将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        // 1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接Key
        String KeySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String Key = USER_SIGN_KEY + userId + KeySuffix;
        // 4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.写入redis SETBIT Key offset 1
        stringRedisTemplate.opsForValue().setBit(Key,dayOfMonth - 1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1.获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接Key
        String KeySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String Key = USER_SIGN_KEY + userId + KeySuffix;
        // 4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截至到今天为止的所有签到记录,返回的是十进制 BITFIELD sign:5:202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                Key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if (result == null || result.isEmpty()){
            // 没有任何结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        int count = 0;
        // 6.循环遍历
        while (true){
            // 6.1.让这个数字与1做与运算，得到数字的最后一个bit位  判断这个位置是否为零
            if ((num & 1) == 0) {
                // 如果为0，说明未签到，结束
                break;
            }else {
                //如果不为0，说明已经1签到，计数器加1
                count++;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一次比对
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
